194 lines
4.8 KiB
Vue
194 lines
4.8 KiB
Vue
<template>
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<view>
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<canvas type="2d" canvas-id="reusableCanvas" :width="currentCanvasWidth" :height="currentCanvasHeight"
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class="offscreen-canvas"></canvas>
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</view>
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</template>
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<script>
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export default {
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name: "TextToHexV1",
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props: {
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txts: {
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type: Array,
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default: () => [],
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validator: (value) => value.every(item => typeof item === 'string')
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},
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fontSize: {
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type: Number,
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default: 16,
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validator: (value) => value > 0 && value <= 100
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},
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bgColor: {
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type: String,
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default: "#ffffff"
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},
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color: {
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type: String,
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default: "#000000"
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}
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},
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data() {
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return {
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// 当前Canvas的宽高（动态调整）
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currentCanvasWidth: 0,
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currentCanvasHeight: 0,
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// Canvas上下文（复用）
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ctx: null
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};
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},
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computed: {
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validTxts() {
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return this.txts.filter(line => line.trim() !== '');
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}
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},
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mounted() {
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// 初始化Canvas上下文（只创建一次）
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this.ctx = uni.createCanvasContext('reusableCanvas', this);
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},
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methods: {
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/**
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* 估算单行文本所需的Canvas宽度
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*/
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calcLineWidth(textLine) {
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return textLine.length * this.fontSize;
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},
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/**
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* 清除Canvas内容
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*/
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clearCanvas() {
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this.ctx.setFillStyle(this.bgColor);
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this.ctx.fillRect(0, 0, this.currentCanvasWidth, this.currentCanvasHeight);
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},
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/**
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* 复用单个Canvas处理所有文本行
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*/
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async drawAndGetPixels() {
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let convertCharToMatrix=function(imageData) {
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// console.log("imgData=",imageData)
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let matrix = [];
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// 逐行处理
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for (let y = 0; y < 16; y++) {
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let byte1 = 0,
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byte2 = 0;
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// 每行16个像素，分为两个字节
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for (let x = 0; x < 16; x++) {
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// 计算像素在imageData中的索引 (RGBA格式)
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let index = (y * 16 + x) * 4;
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let red = imageData[index];
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// 黑色像素（R值较低）视为1，白色视为0
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let isBlack = red < 128;
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if (x < 8) {
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// 第一个字节（左8位）
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if (isBlack) {
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byte1 |= 0x80 >> x; // 从左到右设置位
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}
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} else {
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// 第二个字节（右8位）
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if (isBlack) {
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byte2 |= 0x80 >> (x - 8);
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}
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}
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}
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// 将字节转换为两位十六进制字符串
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matrix.push('0x' + byte1.toString(16).padStart(2, '0').toUpperCase());
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matrix.push('0x' + byte2.toString(16).padStart(2, '0').toUpperCase());
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}
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return matrix;
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}
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let drawTxt=async (textLine)=> {
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let result = {};
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let ctx = this.ctx;
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// 1. 动态调整Canvas尺寸
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this.currentCanvasWidth = this.calcLineWidth(textLine);
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this.currentCanvasHeight = this.fontSize;
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// 2. 清空Canvas（绘制背景）
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this.clearCanvas();
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// 3. 设置文字样式
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ctx.setFillStyle(this.color);
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ctx.setTextBaseline('middle');
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ctx.setFontSize(this.fontSize);
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ctx.font = `${this.fontSize}px "PingFang SC", PingFang SC, Arial, sans-serif`;
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// 4. 绘制当前行文本
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let currentX = 0;
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let currentY = this.fontSize / 2;
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for (let j = 0; j < textLine.length; j++) {
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let char = textLine[j];
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ctx.fillText(char, currentX, currentY);
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// 按实际字符宽度计算间距
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let charWidth = ctx.measureText(char).width;
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currentX += charWidth;
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}
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// 5. 异步绘制并获取像素数据（串行处理避免冲突）
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await new Promise((resolve, reject) => {
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ctx.draw(false, () => {
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uni.canvasGetImageData({
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canvasId: 'reusableCanvas',
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x: 0,
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y: 0,
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width: this.currentCanvasWidth,
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height: this.currentCanvasHeight,
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success: res => {
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result={
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line: textLine,
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pixelData: res.data,
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width: this.currentCanvasWidth,
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height: this.currentCanvasHeight
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};
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resolve();
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},
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fail: err => {
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// console.error(`处理第${i+1}行失败:`, err);
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reject(err)
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}
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});
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});
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});
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return result;
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}
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let arr = [];
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// 循环处理每行文本
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for (let i = 0; i < this.validTxts.length; i++) {
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let linePixls = [];
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let item = this.validTxts[i];
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console.log("item=",item);
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for (var j = 0; j < item.length; j++) {
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let result = await drawTxt(item[j]);
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linePixls.push(convertCharToMatrix(result.pixelData));
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}
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console.log("hexs=",linePixls.join(","));
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arr.push(linePixls);
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}
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return arr;
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}
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}
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};
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</script>
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<style>
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.offscreen-canvas {
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position: fixed;
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left: -9999px;
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top: -9999px;
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visibility: hidden;
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}
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</style> |